2 * \file LaTeXHighlighter.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
8 * Full author contact details are available in file CREDITS.
13 #include "LaTeXHighlighter.h"
14 #include "qt_helpers.h"
17 #include <QTextDocument>
23 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent, bool at_letter, bool keyval)
24 : QSyntaxHighlighter(parent), at_letter_(at_letter), keyval_(keyval)
26 auto blend = [](QColor color1, QColor color2) {
27 int r = 0.5 * (color1.red() + color2.red());
28 int g = 0.5 * (color1.green() + color2.green());
29 int b = 0.5 * (color1.blue() + color2.blue());
30 return QColor(r, g, b);
32 QPalette palette = QPalette();
33 QColor text_color = palette.color(QPalette::Active, QPalette::Text);
34 keywordFormat.setForeground(blend(Qt::blue, text_color));
35 keywordFormat.setFontWeight(QFont::Bold);
36 commentFormat.setForeground(palette.color(QPalette::Disabled,
38 mathFormat.setForeground(blend(Qt::red, text_color));
39 warningFormat.setForeground(Qt::red);
40 warningFormat.setFontWeight(QFont::Bold);
41 keyFormat.setForeground(blend(Qt::darkRed, text_color));
42 keyFormat.setFontWeight(QFont::Bold);
43 valFormat.setForeground(blend(Qt::darkGreen, text_color));
47 void LaTeXHighlighter::highlightBlock(QString const & text)
51 // Highlight key-val options. Used in some option widgets.
52 static const QRegularExpression exprKeyvalkey("[^=,]+");
53 static const QRegularExpression exprKeyvalval("[^,]+");
54 QRegularExpressionMatch matchkey = exprKeyvalkey.match(text);
55 int kvindex = matchkey.capturedStart(0);
56 while (kvindex >= 0) {
57 int length = matchkey.capturedLength(0);
58 setFormat(kvindex, length, keyFormat);
59 QRegularExpressionMatch matchval =
60 exprKeyvalval.match(text, kvindex + length);
61 int kvvindex = matchval.capturedStart(0);
63 length += matchval.capturedLength(0);
64 setFormat(kvvindex, length, valFormat);
66 matchkey = exprKeyvalkey.match(text, kvindex + length);
67 kvindex = matchkey.capturedStart(0);
71 static const QRegularExpression exprMath("\\$[^\\$]*\\$");
72 QRegularExpressionMatch match = exprMath.match(text);
73 int index = match.capturedStart(0);
75 int length = match.capturedLength(0);
76 setFormat(index, length, mathFormat);
77 match = exprMath.match(text, index + length);
78 index = match.capturedStart(0);
81 static const QRegularExpression exprStartDispMath("(\\\\\\[|"
82 "\\\\begin\\{equation\\**\\}|"
83 "\\\\begin\\{eqnarray\\**\\}|"
84 "\\\\begin\\{align(ed|at)*\\**\\}|"
85 "\\\\begin\\{flalign\\**\\}|"
86 "\\\\begin\\{gather\\**\\}|"
87 "\\\\begin\\{multline\\**\\}|"
88 "\\\\begin\\{array\\**\\}|"
89 "\\\\begin\\{cases\\**\\}"
91 static const QRegularExpression exprEndDispMath("(\\\\\\]|"
92 "\\\\end\\{equation\\**\\}|"
93 "\\\\end\\{eqnarray\\**\\}|"
94 "\\\\end\\{align(ed|at)*\\**\\}|"
95 "\\\\end\\{flalign\\**\\}|"
96 "\\\\end\\{gather\\**\\}|"
97 "\\\\end\\{multline\\**\\}|"
98 "\\\\end\\{array\\**\\}|"
99 "\\\\end\\{cases\\**\\}"
102 // if previous block was in 'disp math'
103 // start search from 0 (for end disp math)
104 // otherwise, start search from 'begin disp math'
105 if (previousBlockState() != 1) {
106 match = exprStartDispMath.match(text);
107 startIndex = match.capturedStart(0);
109 while (startIndex >= 0) {
110 match = exprEndDispMath.match(text, startIndex);
111 int endIndex = match.capturedStart(0);
113 if (endIndex == -1) {
114 setCurrentBlockState(1);
115 length = text.length() - startIndex;
117 length = endIndex - startIndex + match.capturedLength(0);
119 setFormat(startIndex, length, mathFormat);
120 match = exprStartDispMath.match(text, startIndex + length);
121 startIndex = match.capturedStart(0);
124 static const QRegularExpression exprKeywordAtOther("\\\\[A-Za-z]+");
126 static const QRegularExpression exprKeywordAtLetter("\\\\[A-Za-z@]+");
127 QRegularExpression const & exprKeyword = at_letter_
128 ? exprKeywordAtLetter : exprKeywordAtOther;
129 match = exprKeyword.match(text);
130 index = match.capturedStart(0);
132 int length = match.capturedLength(0);
133 setFormat(index, length, keywordFormat);
134 match = exprKeyword.match(text, index + length);
135 index = match.capturedStart(0);
138 // Treat a line as a comment starting at a percent sign
139 // * that is the first character in a line
140 // * that is preceded by
141 // ** an even number of backslashes
142 // ** any character other than a backslash
143 QRegularExpression exprComment("(?:^|[^\\\\])(?:\\\\\\\\)*(%).*$");
144 match = exprComment.match(text);
145 index = match.capturedStart(1);
147 int const length = match.capturedLength(0)
148 - (index - match.capturedStart(0));
149 setFormat(index, length, commentFormat);
150 match = exprComment.match(text, index + length);
151 index = match.capturedStart(1);
153 // <LyX Warning: ...>
154 QString lyxwarn = qt_("LyX Warning: ");
155 QRegularExpression exprWarning("<" + lyxwarn + "[^<]*>");
156 match = exprWarning.match(text);
157 index = match.capturedStart(0);
159 int length = match.capturedLength(0);
160 setFormat(index, length, warningFormat);
161 match = exprWarning.match(text, index + length);
162 index = match.capturedStart(0);
166 } // namespace frontend